Advertisements
Advertisements
प्रश्न
Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23)
Advertisements
उत्तर
Given:
Weight of the sodium = 4.6g
Mass of sodium atom = 23
Number of gram moles of Na = `"Mass of Sodium"/"Mass of sodium atom"`
= `4.6/23` = 0.2g
Molar mass of CuSO4.5H2O = ( 64 ) + ( 32 ) + (9 x 16) + (10 x 1) = 250
Molar mass of 5.H2O molecules = ( 10 x 1) + ( 5 x 16) = 90
Percentage of water of Crystallisation = `[ 90 xx 100]/250` = 36%
APPEARS IN
संबंधित प्रश्न
Convert into mole.
22 g of carbon dioxide
What is the mass of 0.2 mole of oxygen atoms?
What name is given to the amount of substance containing this number of atoms ?
How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u)
Explain the term:
Gram mole
A sample of ammonium nitrate when heated yields 8.96 litres of steam (measured at STP)
NH4NO3 → N2O + 2H2O
What volume of dinitrogen oxide is produced at the same time as 8.96 L of steam?
From the equation for burning of hydrogen and oxygen
\[\ce{2H2 + O2 -> 2H2O}\] (Steam)
Write down the number of mole (or moles) of steam obtained from 0.5 moles of oxygen.
Calculate the number of moles in 7g of nitrogen.
Solid ammonium dichromate decomposes as:
\[\ce{(NH4)2Cr2O7 -> N2 + Cr2O3 + 4H2O}\]
If 63 g of ammonium dichromate decomposes. Calculate the quantity in moles of nitrogen formed.
Calcium chloride when dissolved in water dissociates into its ions according to the following equation.
\[\ce{CaCl2} (aq) → {Ca^{2+} (aq) + 2{Cl}- (aq)}\]
Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water.
